The second picture in #6. Proofed for smokeless (Nitro), using 15 grams of powder and a Steel Jacketed Bullet (Stahl Mantel Geschoss)
The bird over the Crown-over-U looks like the final black powder proof.
The more I look, the confuseder I get.
The height of the cross on the crowns looks East German, 1950 to 1992, Suhl proofhouse.
Everything else appears to be 1891 to 1939.
Look at #10 on this page. Crown over W - choked barrel.
http://www.shotguns.se/html/germany_1890-1945.html
Then the 6th one in the second table here. Also crown over W. Also choked barrel. The height of the cross.
http://www.shotguns.se/html/east_germany.html
I'm pretty sure it's German.

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Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.